I have very strange problem. Whatever hot end temperature I set, it manages to come 2-3 degrees below it and it just stands there for hours sometimes, and sometimes even starts to print after some time. It can reach very high temperatures but somehow it just stops few degrees before goal temperature.
Anyone had this issue?
I would start by checking that your thermistor is making good contact with your heat block and that the wires for the thermistor aren't shorting to the block or each other.
